Yesterday the cutoff low spinning off the coast of Oregon/NCalifornia contributed to the front that brought thunderstorms to WWA. Today the cutoff low has halted its southward advance and has reversed direction ... it is heading northeast into Washington tomorrow to be reabsorbed by the jet stream.
The low is packing a lot of moisture and lift ... Friday should be very wet in WWA with some areas in the central Sound and along the Cascades seeing up to an inch of rain. The GFS MOS for KSEA gives 0.25 - 0.5 inches for tomorrow. Although conditions won't be as unstable as yesterday, thunderstorms could pop up easily. GFS MOS has tstorm odds at 34%.
Prepare for some heavy rain tomorrow ... should be a nice temporary reprieve from the drought!
